Method for shortening feeding time of converter

Abstract

The invention belongs to the technical field of metallurgical cranes, and discloses a method for shortening the feeding time of a converter. Comprising the steps of crane operation position cart positioning (mounting cart positioning marks through track beams, and mounting infrared positioners on facades and waiting positions of plants to achieve rapid positioning and height presetting) and crane operation position trolley positioning (mounting main trolley positioning marks at the positions of 3000mm of box beams to achieve accurate stopping and avoiding before and after feeding). Feeding cross-crane efficient cooperative scheduling (electronic tags are installed through safety guardrails, and a reader-writer and a PLC are installed on a body to achieve real-time sharing of the position and the load state to an operation room picture) and crane converter feeding (through time sequence matching of a scrap steel hopper and a hot-metal bottle; according to the multi-crane co-span cooperative scheduling method, the co-span cooperative scheduling effect of the multiple cranes is optimized, then the overall feeding time of the converter is shortened, and the operation rate and the productivity stability of the converter are improved.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical crane technology, specifically relating to a method for shortening converter feeding time. Background Technology

[0002] Converter steelmaking, as a core process in integrated steel production, directly impacts the smelting rhythm, thermal balance, and overall capacity of the converter through the precise and efficient feeding of molten iron and scrap steel. Cranes, as key equipment in the feeding process, are crucial factors affecting the converter smelting cycle due to their operational efficiency and stability. Under the current employee experience-based operating model, fluctuations in operating time are easily caused by equipment variations, insufficient crane positioning accuracy, and individual employee skills, becoming one of the main bottlenecks restricting the improvement of converter operating rates. Currently, the feeding operations of converter processes in the metallurgical industry, particularly the operation of scrap steel and molten iron cranes, still heavily rely on the experience and skill of the drivers, resulting in significant technical bottlenecks: First, manual operation makes it difficult to achieve precise coordination between the trolley, hoisting mechanism, and other components; second, the long span hoisting distance and high lifting height lead to lengthy positioning times, with single-furnace feeding times for converters of 210 tons or more typically reaching 4-5 minutes, becoming a key bottleneck restricting converter capacity improvement; third, human error can easily cause excessive swaying of the hoisted load, increasing the risk of safety accidents such as splashing, slag overflow, and scrap steel spillage, and also accelerating wire rope wear; fourth, most enterprises have 3-5 cranes in the feeding area, lacking an efficient collaborative scheduling mechanism, which easily leads to operational interference and waiting time, further lengthening the feeding cycle; and the traditional operating mode's strong reliance on manual labor also results in large fluctuations in operating efficiency, making it difficult to adapt to the steel industry's development trend of improving quality and efficiency, and green safety.

[0003] Existing crane operation methods for converter feeding suffer from low efficiency, high safety risks, insufficient control precision, and poor coordination. There is an urgent need for a crane operation method that can shorten feeding time, improve operational accuracy and coordination efficiency, thereby overcoming existing technological bottlenecks and meeting the practical needs of the current steel industry for reduced output, low steel purchase and sale price differences, and the pursuit of maximum cost, maximum efficiency, and safety. Specifically, inaccurate positioning due to manual reliance prolongs the feeding time for each furnace, directly reducing converter operating rates; lack of coordination causes multiple cranes to frequently wait or interfere, further amplifying cycle fluctuations; excessive swaying not only threatens safety but also increases equipment maintenance costs. These problems collectively restrict the stability of converter capacity and the overall efficiency improvement of the production line. Therefore, existing technologies urgently need to address these multiple technological bottlenecks through the integration of specific positioning auxiliary devices and scheduling mechanisms. Summary of the Invention

[0004] In view of this, the purpose of this invention is to solve the technical problems of high dependence on manual operation of cranes, low positioning and coordination efficiency, and large fluctuations in feeding time during the existing converter feeding process, and to provide a method to shorten the converter feeding time, optimize the coordinated scheduling effect of multiple cranes in the same span, thereby shortening the overall converter feeding time and improving the converter operating rate and production capacity stability.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A method for shortening converter feeding time includes the following steps: Crane trolley positioning: By installing scrap steel crane trolley positioning marks on the crane track beam above the scrap steel scale in the scrap steel pit, infrared positioning devices for scrap steel bucket loading height on the facade of the waiting area on the south side of the converter front platform, scrap steel crane converter feeding positioning marks on the crane track beam above each converter, and iron molten steel crane trolley positioning marks on the crane track beam above the iron molten steel ladle car track in the iron molten steel hoisting hole area, infrared positioning devices for iron molten steel ladle loading height on the iron molten steel crane waiting area, and iron loading crane trolley converter iron loading positioning marks on the crane track beam above each converter, the rapid positioning of scrap steel cranes and iron molten steel crane trolleys and the pre-adjustment of the height of scrap steel buckets and iron molten steel ladles are achieved, thus solving the problem of time-consuming manual positioning. Crane operating position trolley positioning: By installing positioning marks for the main trolley of the scrap steel crane at the east side box girder position and for the main trolley of the molten iron crane at the east side box girder position, rapid positioning and repositioning of the scrap steel hopper before and after the converter feeds scrap steel, and rapid positioning and retraction of the molten iron ladle before and after the converter pours iron, the problem of insufficient coordination accuracy of the trolley, hoisting mechanism, and crane is solved. Efficient collaborative scheduling of cranes in the charging span: By installing electronic tags for crane track positioning on the safety guardrail on the west side of the crane track beam in the charging span, installing electronic tag readers on the west side of the bodies of multiple scrap steel cranes and multiple molten iron cranes in the charging span, and installing PLC controllers and related reading and writing equipment on each crane, the position and working status of each crane are transmitted wirelessly to the crane beam system terminal, transmitted via fiber optic cable to the system host, and then pushed to the system computer screens in each operator's room of the converter process. This enables real-time sharing of the position and status of multiple cranes and optimal command and scheduling, thereby solving the problems of operational interference and idle waiting time. Crane converter feeding: Before the slag splashing protection ends, the scrap hopper is pre-aligned with the converter and its height is consistent with the angle at which the scrap is fed into the converter. When the converter stops at the scrap feeding angle, the front edge of the scrap hopper quickly enters the furnace mouth while the auxiliary hook is raised step by step. After feeding, the trolley quickly moves westward and exits the furnace mouth, while the main trolley moves north and south to make way. At the same time as scrap feeding, the auxiliary hook of the molten iron crane approaches the trunnion to maintain a safe distance of 300mm, and the height of the ladle is consistent. After the scrap is withdrawn, the molten iron crane aligns with the hook and gradually approaches. When the converter stops at the iron dispensing position, it quickly approaches and raises the auxiliary hook step by step. After iron dispensing is completed, the main and auxiliary trolleys quickly move westward and exit the furnace mouth. This timing matching operation achieves precise coordination and one-time completion of the feeding process, thereby solving the problems of large fluctuations in the feeding cycle and high safety risks.

[0006] Furthermore, in the positioning of the trolley in the crane operating position, the positioning marks of the trolley of the molten iron crane are distinguished by different colors and lengths, respectively corresponding to two molten iron cranes with different cab positions, and are installed on the crane track beam above the three molten iron ladle car tracks of the molten iron hoisting hole.

[0007] Furthermore, in the positioning of the crane operating position trolley, the positioning marks of the scrap steel crane main trolley and the molten iron crane main trolley are respectively installed at the position 3000mm east of the box girder of their respective north and south trolley cranes, so as to trigger the operation immediately after the feeding command arrives and trigger the yielding action after exiting.

[0008] Furthermore, in the efficient collaborative scheduling of the feeding cranes, there are 3-5 electronic tag readers for positioning the crane track position. These are installed on the west side of the bodies of 2 scrap steel cranes and 2 molten iron cranes. The PLC controller identifies the load working status through the main and auxiliary hook scales or overload limiters.

[0009] Furthermore, in the efficient collaborative scheduling of the feeding cranes, the transmission path for location and working status information is PLC controller → wireless transmitter → crane beam system terminal → optical fiber → system host → computer screen of each operating room in the converter process. The operators in the operating room select the optimal command path in real time based on the screen.

[0010] Furthermore, in the scrap feeding step of the crane in the converter, the height of the scrap hopper during pre-alignment is consistent with the scrap feeding angle of the converter at 65°±3°. When feeding scrap, the bottom of the front end of the hopper is 100-300mm away from the bottom of the furnace opening. After feeding, when the front end of the hopper is 2000mm away from the smoke baffle, the trolley quickly moves north and south to make way.

[0011] Furthermore, in the iron-addition step of the converter feeding by the crane, the converter is stopped when it is tilted to the iron-addition position of 48°±3°. During the iron-addition process, the bottom of the ladle is kept about 300mm higher than the bottom of the furnace opening, the tilting speed is matched with the iron-addition speed of the ladle, and the trolley can only be started when the east side of the ladle is about 2000mm away from the smoke baffle.

[0012] The beneficial effects of this invention are as follows: This invention solves the problem of time-consuming manual positioning by establishing the positions, connections, and rapid positioning relationships of the scrap crane trolley positioning marks on the track beam, the infrared positioner for the scrap hopper entering the furnace on the plant facade, the scrap crane charging positioning marks above each converter, the iron crane trolley positioning marks in the iron hoisting hole area, the infrared positioner for the iron ladle pouring height at the iron waiting position, and the iron pouring positioning marks of the iron pouring crane trolley above each converter. This allows for rapid alignment of the scrap crane and iron crane trolleys, ensuring consistent pre-adjustment of the scrap hopper and iron ladle heights, eliminating the time wasted on repeated adjustments. The crane trolley positioning step solves the problem of insufficient coordination accuracy among the trolley, trolley, and hoisting mechanism by establishing the positions, connections, and functions of the scrap crane trolley positioning marks on the east side box beam and the iron crane trolley positioning marks on the east side box beam. This enables the efficient feeding of scrap steel into the converter. The system enables rapid positioning and repositioning of the front and rear scrap hoppers, as well as rapid positioning and retraction of the molten iron ladles before and after iron pouring, avoiding repeated manual fine-tuning. The efficient collaborative scheduling of the feeding cranes utilizes electronic tags for crane track positioning on the west side safety railing of the feeding crane's track beam, readers for multiple cranes' west side track positioning tags, and the installation, connection, and wireless-fiber optic information transmission links of the PLC controllers and related reading / writing devices on each crane. This solves the problems of operational interference and idle waiting time, enabling real-time sharing of the real-time position and load status of multiple cranes and optimal command and dispatch from the control room. The crane converter feeding process addresses the issues of large fluctuations in the feeding cycle and high safety risks by pre-aligning the scrap hopper before the end of slag splashing and furnace protection, matching the timing of scrap feeding and iron pouring, and the positioning, connection, and interaction of repositioning actions and safety distance control. This achieves precise coordination and one-time completion, reducing swaying of the load, slag spillage, and repeated furnace shaking.

[0013] This method, through a hierarchical combination of four operations—large trolley positioning, small trolley positioning, collaborative scheduling, and feeding timing—not only adapts to various converter steelmaking production lines in the metallurgical industry but also significantly improves operational stability and safety, reduces equipment wear and maintenance costs, and meets the actual needs of the steel industry for extreme efficiency, green safety, and reduced production.

[0014] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0015] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the crane's working position positioning in this invention.

[0016] Figure 2 This is a schematic diagram of the positioning of the crane work station trolley in this invention.

[0017] Figure 3 This is a schematic diagram of the efficient collaborative scheduling of the feeding cranes in this invention.

[0018] Attached reference numerals: 1-Scrap steel scale; 2-Iron ladle height infrared positioner; 3-Converter iron hoisting hole, iron transport line; 4-Converter furnace front platform; 5-Scrap steel hopper inlet height infrared positioner; 6-Charging span converter iron hoist; 7-Charging span converter scrap steel hoist; 8-Charging span converter scrap steel hoist, scrap steel scale hoisting point trolley positioning mark; 9-Charging span No. 3 iron hoisting crane trolley converter iron hoisting positioning mark; 10-Charging span No. 2 iron hoisting crane trolley converter iron hoisting positioning mark; 11-Charging... 12-Crane trolley track; 13-2# scrap steel crane; 14-2# scrap steel crane; 15-1# scrap steel crane; 16-1# scrap steel crane; 17-Scrap steel crane main trolley positioning mark; 18-Iron crane main trolley positioning mark; 18-Crane track position positioning electronic tag reader; 19-Crane track; 20-Feeding iron crane across molten iron; 21-Feeding scrap steel crane across molten steel; 22-Safety railing; 23-Crane track position positioning electronic tag. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0020] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0021] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0022] Example 1 like Figures 1-3 As shown, this is a method for shortening converter feeding time, including crane workstation trolley positioning operation, crane workstation trolley positioning operation, efficient collaborative scheduling operation of feeding across cranes, and crane converter feeding operation.

[0023] like Figure 1 As shown, the following are the locations: 8, a positioning marker 8 for the trolley of the feeder crane (for the converter feeder scrap steel weigher) is installed on the feeder crane track 11 above the scrap steel weigher 1; an infrared positioning device 5 for the scrap steel hopper feed height is installed on the facade of the waiting area on the south side of the converter front platform 4; corresponding converter feeder positioning markers 8 are installed on the feeder crane track 11 above each converter; and the feeder crane track 11 above the three molten iron ladle car tracks in the molten iron transport line 3 area is also shown. Install positioning markers for the trolleys of the charging bridge converter iron-pouring cranes (the two charging bridge converter iron-pouring cranes 6 are distinguished by different colors and lengths, corresponding to different cab positions); install infrared positioning devices 2 for the iron ladle iron-pouring height at the iron-pouring crane waiting position; install positioning markers 9 for the trolleys of the charging bridge #3 iron-pouring crane and 10 for the trolleys of the charging bridge #2 iron-pouring crane on the charging bridge crane track 11 above each converter; the crane trolley track 12 is located below the charging bridge crane track 11.

[0024] like Figure 2 As shown, the main trolley positioning mark 17 of the scrap steel crane 7 is installed at the position 3000mm east of the box girder on the north and south sides of the north and south trolleys of the feeder converter; the main trolley positioning mark 18 of the molten iron crane 20 is installed at the position 3000mm east of the box girder on the north and south sides of the feeder converter.

[0025] like Figure 3As shown, a crane track position positioning electronic tag 23 is installed on the safety guardrail 22 on the west side of the crane track beam in the feeding span; 3-5 crane track position positioning electronic tag readers 18 (determined according to the size of the crane) are installed on the west side of the main body of the scrap steel crane 21 and the molten iron crane 20 in the feeding span; the crane track 19 is located below the crane track 11 in the feeding span.

[0026] When using the charging bay in the converter steelmaking plant, the crane's trolley positioning operation is performed first: When the converter scrap steel inlet crane 7 in the charging bay is above the scrap steel scale 1, the driver quickly aligns the trolley with the scrap steel scale lifting point positioning mark 8 of the charging bay's converter scrap steel inlet crane to lift and lower the scrap steel bucket; after lifting the scrap steel bucket, the driver uses the scrap steel bucket inlet height infrared positioning device 5 to pre-adjust the height at the waiting position on the south side of the converter furnace front platform 4, so that it is consistent with the angle of the converter scrap steel inlet; the converter molten iron inlet crane 6 in the charging bay is above the molten iron conveying line 3 of the converter molten iron lifting hole, and the driver aligns the trolley with its special positioning mark to lift and lower the molten iron ladle. After lifting, the driver uses the molten iron ladle inlet height infrared positioning device 2 to pre-adjust the height at the waiting position, so that it is consistent with the angle of the converter molten iron inlet and does not affect the operation of this bay.

[0027] Next, the crane's trolley positioning operation is performed: Before the scrap steel is fed into the converter, the scrap steel feeding crane 7 in the charging span uses the main trolley positioning marker 17 of the scrap steel crane to pre-position the scrap steel hopper at a position 3000mm from the east box girder; after feeding the scrap steel and exiting, it uses the same marker to position itself again. Similarly, before and after the molten iron is poured by the molten iron feeding crane 20, the main trolley positioning marker 18 of the molten iron crane is used to precisely stop and exit the molten iron ladle at a position 3000mm from the east box girder.

[0028] Meanwhile, the efficient collaborative scheduling operation of the charging span cranes is running in real time: each crane identifies the crane track position positioning electronic tag 23 through the crane track position positioning electronic tag reader 18 on the west side of the main body, and the PLC controller transmits the position and load working status to the gantry beam system terminal via a wireless transmitter, then to the system host via optical fiber, and finally pushes it to the system computer screen of each operator room in the converter process; the operators in the operator room can view the position and status of each crane (charging span scrap steel crane 21, charging span molten iron crane 20, No. 2 scrap steel crane 13, No. 2 scrap steel crane 14, No. 1 scrap steel crane 15, No. 1 scrap steel crane 16) in real time according to the screen, and select the optimal command path in combination with the converter production rhythm.

[0029] Finally, the crane is used for converter feeding: Before the converter slag splashing protection ends, the scrap steel feeding crane 7 in the charging span of the converter is positioned as described above to pre-align the scrap steel hopper with the converter, maintaining a height consistent with the converter scrap steel feeding angle of 65°±3°, and the scrap steel hopper opening is about 2000mm away from the smoke baffle; when the converter stops rocking at the scrap steel feeding angle, the front edge of the scrap steel hopper quickly enters the furnace mouth, and at the same time, the auxiliary hook is lifted step by step, with the bottom of the front edge of the scrap steel hopper 100-300mm away from the bottom of the furnace mouth when feeding scrap steel; after feeding scrap steel, the trolley quickly moves westward and exits the furnace mouth, and when the front edge of the scrap steel hopper exits about 2000mm away from the smoke baffle, the main trolley quickly moves north and south to make way.

[0030] Meanwhile, as scrap steel begins to be fed into the converter, the auxiliary hook of the charging bridge converter trolley 6 approaches the ladle hanging point trunnion and maintains a vertical and horizontal safety distance of 300mm. The height of the ladle is consistent with the converter trolley trolley trolley trolley trolley trolley 7. The east side of the ladle is about 2000mm away from the smoke baffle. After the scrap steel feeding crane 7 of the charging bridge converter exits the converter, the molten iron feeding crane 20 of the charging bridge aligns with the converter, hangs the auxiliary hook, and gradually approaches the furnace mouth. When the converter stops rocking at the trolley trolley trolley 48°±3°, the charging bridge converter trolley trolley trolley 6 quickly approaches the furnace mouth and raises the auxiliary hook step by step to start trolley ...

[0031] Through the organic combination and timing matching of the above four steps, precise coordination of the trolley, hoisting mechanism, real-time sharing of the location and status of multiple cranes, and interference-free one-time completion of scrap steel feeding and iron exchange are achieved.

[0032] This method has been successfully applied to the operation of the charging crane in the steelmaking plant's converter. The charging time for a single furnace using the 350-ton crane has been reduced from the original 5 minutes to a minimum of 3 minutes and an average of 3.35 minutes, with the shortest charging cycle reaching 2 minutes. Each converter produces 41 furnaces per day (24h × 60min / 35 min / furnace smelting cycle). With three converters planned at a coefficient of 0.9, the production is 3 × 41 × 0.9 = 110.7 furnaces. The daily savings for the three converters are 110.7 × (5 - 3.35) = 182.7 minutes. Assuming 360 production days per year, the annual savings are 360 ​​× 182.7 = 65772 minutes. The annual economic benefit is 65772 / 35 (min / furnace smelting cycle) × 210 (t / furnace) × 100 (yuan / t) = 3946.32 (ten thousand yuan).

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for shortening converter feeding time, characterized in that, Includes the following steps: Crane operation position trolley positioning: By installing scrap steel crane trolley positioning marks on the crane rail beam above the scrap steel scale in the scrap steel pit, installing infrared positioning devices for scrap steel bucket furnace feeding height on the facade of the waiting area on the south side of the converter furnace platform, installing scrap steel crane converter feeding positioning marks on the crane rail beam above each converter, installing iron molten steel crane trolley positioning marks on the crane rail beam above the iron molten steel ladle car rail in the iron hoisting hole area, installing infrared positioning devices for iron molten steel ladle pouring height at the iron molten steel crane waiting area, and installing iron pouring crane trolley converter iron pouring positioning marks on the crane rail beam above each converter, the rapid positioning of scrap steel cranes and iron molten steel crane trolleys and the pre-adjustment of the height of scrap steel buckets and iron molten steel ladles can be achieved. Crane operating position trolley positioning: By installing a scrap steel crane main trolley positioning mark at the box girder on the east side of the scrap steel crane trolley and a molten iron crane main trolley positioning mark at the box girder on the east side of the molten iron crane trolley, the position of the scrap steel hopper before and after the converter scrap steel is fed into the converter, and the position of the molten iron ladle before and after the converter iron is poured into the converter, the position of the molten iron ladle is quickly positioned and moved out. Efficient collaborative scheduling of cranes in the charging span: By installing electronic tags for crane track positioning on the safety guardrail on the west side of the crane track beam in the charging span, installing electronic tag readers on the west side of the bodies of multiple scrap steel cranes and multiple molten iron cranes in the charging span, and installing PLC controllers and related reading and writing equipment on each crane, the position and working status of each crane are transmitted to the crane beam system terminal via a wireless transmitter, transmitted to the system host via optical fiber, and then pushed to the system computer screens of each operator room in the converter process, realizing real-time sharing of the position and status of multiple cranes and optimal command and scheduling; Crane converter feeding: Before the slag splashing protection ends, the scrap hopper is pre-aligned with the converter and kept at the same height as the angle at which the scrap is fed into the converter. When the converter stops at the angle where the scrap is fed, the front edge of the scrap hopper quickly enters the furnace mouth while the auxiliary hook is raised step by step. After feeding, the trolley quickly moves westward and exits the furnace mouth, while the main trolley moves north and south to make way. At the same time as the scrap is fed, the auxiliary hook of the molten iron crane approaches the trunnion to maintain a safe distance of 300mm and the height of the ladle is consistent. After the scrap is withdrawn, the molten iron crane aligns with the hook and gradually approaches. When the converter stops at the iron dispensing position, it quickly approaches and raises the auxiliary hook step by step. After iron dispensing is completed, the main and auxiliary trolleys quickly move westward and exit the furnace mouth. This timing matching operation achieves precise coordination and one-time completion of the feeding process.

2. The method according to claim 1, characterized in that, In the positioning of the trolley in the crane operating position, the positioning marks of the trolley of the molten iron crane are distinguished by different colors and lengths, respectively corresponding to two molten iron cranes with different cab positions, and are installed on the crane track beam above the three molten iron ladle car tracks of the molten iron hoisting hole.

3. The method according to claim 1, characterized in that, In the positioning of the crane operating position trolley, the positioning marks of the scrap steel crane main trolley and the molten iron crane main trolley are respectively installed at the position 3000mm on the east side box girder of their respective north and south trolley cranes, so as to trigger the operation immediately after the feeding command arrives and trigger the yielding action after the withdrawal.

4. The method according to claim 1, characterized in that, In the efficient collaborative scheduling of the feeding cranes, there are 3-5 electronic tag readers for crane track positioning, which are installed on the west side of the bodies of 2 scrap steel cranes and 2 molten iron cranes. The PLC controller identifies the load working status through the main and auxiliary hook scales or overload limiters.

5. The method according to claim 1, characterized in that, In the efficient collaborative scheduling of the charging crane, the transmission path of location and working status information is PLC controller → wireless transmitter → crane beam system terminal → optical fiber → system host → computer screen of each operating room in the converter process. The operators in the operating room select the optimal command path in real time based on the screen.

6. The method according to claim 1, characterized in that, In the scrap feeding step of the converter by crane, the height of the scrap hopper is consistent with the scrap feeding angle of the converter at 65°±3° when pre-aligning. When feeding scrap, the bottom of the front end of the hopper is 100-300mm away from the bottom of the furnace opening. After feeding, when the front end of the hopper is 2000mm away from the smoke baffle, the trolley moves quickly north and south to make way.

7. The method according to claim 1, characterized in that, In the iron-addition step of the converter feeding process, the converter is stopped when it reaches the iron-addition position of 48°±3°. During the iron-addition process, the bottom of the ladle should be kept about 300mm higher than the bottom of the furnace opening, the furnace shaking speed should be matched with the iron-addition speed of the ladle, and the trolley can only be started when the east side of the ladle is about 2000mm away from the smoke baffle.

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